General :: Appending To The Current Line In A File Instead Of Creating A New Line?

Apr 1, 2011

I am combining data from a couple different input files and creating an output file in a specific format. I notice that if I use the >> operator, information gets appended to a new line in my output file. This is useful, but if I'd like to append onto the CURRENT line, is there an easy way to do this? I've been googling around and see lots of complicated answers, nothing that suggests to me an easy way to do this. For example, if my output file looks like this:

b1a:] cat test
hello my name is
b1a:]

and I'd simply like to append "Bob", how can I do it? If I use

b1a:] echo Bob >> test
b1a:] cat test
b1a:] hello my name is
Bob
b1a:]

So what I would prefer is some command that would create the result:

hello my name is Bob

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General :: Command For Appending A Text At The Start Of Every Line And Save It Another File?

Mar 10, 2011

I wish to append a text at the start of every line and save it to another file without changing the original file.know the command

For example:
Orignal.txt
a.txt

[code]...

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General :: Xterm - Go Onto Next Line When End Of Current Line Is Reached?

Jan 7, 2010

I am using xterm and sometimes when typing long commands into a small window, the command extends beyond the end of the line. On my old uni setup, when this happens, the cursor moves to the line below and you can see what text you have typed above however on my slack 13 setup, it overwrites the current line so you cannot see what you have typed! How can I set xterm to move onto the next line instead of overtyping?

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General :: Command Line - Create Directories That Don't Exist While Creating A New File?

May 8, 2010

I can do:mkdir messages and then: touch messages/hello.txt Is there a command that will do both - create the directory if it doesn't exist, and then the empty file? Something like: touch -p messages/hello.txt

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Programming :: Access A File Line By Line, And Check The Length Of Each Line.

Feb 13, 2011

I want to access a file, and check the length of every line.After, i want to check and replace all lines with length over 10 characters, with a message.Does anyone have a clue on that?

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General :: Scripting - Feed An Input File Into An If Statement Line-by-line

Dec 23, 2009

I am trying to write a script that takes an input file ($FileName) and an intermediate file ($FileName.info) and removes lines from $FileName if the value in $2 of $FileName.info is <75.

I can't figure out how to feed only one line of the .info file to the if statement at a time so that it will perceive it as an integer instead of a list.

The error I am getting now is ./script.sh: line 6: [: : integer expression expected

Sample input $FileName

Code:

Code:

Code:

Script so far:

Code:

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General :: Parse A File And Print Each Line That Ends With Matching Pattern (if The Next Line Is Blank)

Aug 2, 2010

I've written a script to parse a file and print each line that ends with matching pattern, if the next line is blank. The pattern lines are the result of md5sum $i|sed 's/path///g' so that only md5 and filename appear. Here's what I'm using.

Quote:
for fline in `sed -n '/.*.ext$/p' file1`
do
if [ "`sed -n -e '/'"$fline"'/ {n; p;}' file1`" == "" ]
then
echo ""$fline" has no info" >>file2
fi
done
[Code]....

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General :: Command Line Way To View A Line Of A File With Context?

Feb 24, 2011

I'd like show a certain line or lines of a file with context, kind of like a unified diff, on the command line in Linux:

$ (something) -l 154 stuff.py
150: def foo(bar):
151: """

[code]....

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Programming :: Programing - Reading File Line By Line Then Char By Char In Each Line

May 29, 2010

I've never programed shell scripting.

Code goes like so:

I simply want to read a file "data.txt" line by line Then char by char and add them into a result var. The file is supossed to always contain numeric values

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Programming :: Create File Listing In C++ That Will Generate Line Number On Every Line Of Code

Apr 11, 2010

I have a project due for my Intro to C++ class and we are suppose to generate a file listing that will take an input of a C++ source code with .cpp extension and make a copy of it with a .lst extention that will have a line number preceding each and every line.

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Programming :: Adding Line From File1 Into A Line Of Another File Based On Maching IDs

Jan 3, 2011

I wish to add information to one of my files based on matching IDs,

Here is an example

(the id is the 3 colunm)

(the ID is the 2 colunm)

And the output i wish to be

OUTPUT:

So as you can see the ones that do not match are still present, and the ones that do match just have the extra information from file2.txt added to them.

I thought about using join but that only seems to join the ones that match displays thoes only. i would like all the information in the output file.

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Programming :: Open Two Text Files - Read Them Line By Line And Update Parameters Of The 3rd File ?

Oct 18, 2010

I have two txt files containing x and y coordinates: xcoord.txt & ycoord.txt. I need to open them; read them line by line to get each coordinate; then each time I need to update Xs and Ys parameters inside another file called "dc.in" with the grabbed values.

Finally each time I need to run two exe files ( dc_2002 and st_vac) and produce corresponding output for each Xs and Ys ( dc.in is an input file for this exe files)

I have written the following code but it does not work:

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Programming :: Perl - Delete Line From Text File With Duplicate Match At Beginning Of Line

Apr 1, 2009

Was wondering if any perl guru's could help me with a quick log file adjustment. I have a text file that looks like so (tabs and newlines are revealed so you can see what separates the data):

There are maybe 100 lines of text in this file at any given time. I need to delete all duplicate lines only looking at the first bit of text prior to the first tab. It doesn't matter which one gets deleted as long as there are no two lines that begin with that same text at the beginning before the first tab. So in this example, either the fist line "1234" or the last line "1234" would need to be deleted. I already have code in my script that opens the files - I just need the code to read the text into an array and the part that would find matches based on the above criteria, and make the deletions.

If it would be easier, I can even do a system call and use SED (v4.1.5) and/or AWK (3.1.5) instead.

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Programming :: Bash: Read A Text File Line By Line?

Jul 7, 2011

bash 3.1.17(2) I'm trying do write a shell script which must operate on each line of an ASCII text file. So, all the code must be inside a loop, and inside the loop, the first thing should be to read the next line from the file. I have the bash read command. But it reads from stdin. Any way to make read from a file?

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Programming :: Copy And Replacing Specific Line From File1 To File2 Line By Line

Mar 22, 2011

I have two files, file1.traj and file2.traj. Both these files contain identical data and the data are arranged in same format in them. The first line of both files is a comment.

At line 7843 of both files there is a cartesian coordinate X, Y and Z ( three digits ). And at line 15685 there is another three digits. The number of lines in between two cartesian coordinates are 7841. And there are few hundreds of thousands of lines in a file.

What I need to do is copy the X Y Z coordinate (three digits) from file1.traj at line 7843 and paste into file2.traj at the same line number as in file1.traj. The next line will be 15685 from file1.traj and replace at line 15685 at file2.traj. And I dont want other lines (data) in file2.traj get altered. This sequence shall be going on until the end of the file. Means copy and substitude the selected lines from file1.traj into file2.traj.

I tried to use paste command but I cant do for specified line alone.

Here i showed the data format in the file. I used the line number for clarity purpose.

Code:

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Programming :: C - Copy File Line By Line With Some Slight Changes?

Mar 2, 2010

In C, I want to make a program that will take a file and replace it with a file that's nearly the same but with some minor changes. Also, I would like to point out that I'm still fairly much a beginner with C. As for an example of the file, I want to take something like this:

Code:

Random Crap
More Random Crap
Even More
Something That Changes XXXXX

[code]....

I figured the best way to go about doing this was to open the file and a blank file, read the original bit by bit and when it gets to the point that needs to be changed exchange the part that needs to be changed with what it should be changed to, delete the original file, and rename the new one to the correct name. So the first problem I've run into (and I'll probably have more) is that when I'm trying to read stuff from the original file, my program doesn't seem to be finding the original. I'm sure much of my problems will be just from not knowing how to use the C functions so bear with me. Right now I have the following:

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

[code]...

And when I try to run it I get the following:

Code:

Died Here: No such file or directory
Segmentation fault

Right now the length of 50 was just a random test length. Pretty much I was just trying to get it to read anything from the file. In the end I'm going to want it to read the entire file bit by bit, but at the moment I can't seem to get it to read anything.

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Programming :: Error During Reading A File Line By Line In C?

Mar 6, 2010

I have a code over there. It reads a line from file and converts contents of it to double.

Code:
/*
* fileRead.c

[code]...

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Programming :: QTimer To Read A File Line After Line?

Mar 25, 2010

I need a qtimer to trigger reading of a file line by line, I have the code sort of running with the timer trigger but qtimer will just read the first line over and over as it is now.

Here is the code so far:

self.lcdtimer = QTimer()
self.connect(self.pushButton85,SIGNAL("clicked()"),self.update)
self.connect(self.lcdtimer, SIGNAL("timeout()"), self.lcdxyz)

Code:

def lcdxyz(self):
import time
import os

[code]....

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General :: Bring Cursor To 1st Char In Current Line (Command Mode)

Dec 4, 2010

Just in case someone can reply a silly question, I've quite forgot the vi/vim command to bring the cursor to the 1st char in the current line. I do remember that for bringing it to EOL is '$'.

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Software :: How To Read Line By Line In A File In C

Feb 5, 2010

i want to read line by line in a files in C language actually my porblem is i have a one file cotains

AT
OK

if iam using fgets, it is reading each time AT only it does not moving to Ok in that file

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Programming :: Deleting Line By Line From A File?

Apr 21, 2010

this script returns me :

sed: -e expression #1, char 2: extra characters after command
sed: -e expression #1, char 2: extra characters after command

Code:

#!/bin/bash
while read line
do
sed -i "$line" 'd' test.txt
done < test.txt

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Programming :: Insert A Line/value After A Particular Line In File With Sed?

Jan 13, 2010

I need to run a command in a shell script to insert a line in a file, after it finds certain line. To add the line 'user = mysql' after the line [mysqld] in file /etc/my.cnf

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Programming :: How To Read Line By Line In A File In C

Feb 5, 2010

i want to read line by line in a files in C language actually my porblem is i have a one file cotains

if iam using fgets, it is reading each time AT only it does not moving to Ok in that file

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Programming :: Read File Line By Line?

Mar 23, 2011

so I have a script that creates couple of txt files. First file output is something like below..

cn=test,ou=something,ou=some,o=org
cn=testa,ou=something,ou=some,o=org
cn=testb,ou=something,ou=some,o=org

second file output is something like below..
usera
userb
userc

Quote:

userdn=`ldapsearch -x -h $server -LLL "(objectclass=person)" dn | grep dn: | cut -d" " -f2 > userdn.txt

for i in $(cat userdn.txt);do

ldapsearch -h $server -p 389 -x -D $admid -w $admpwd -s one -b "$userdn" dn | grep dn: | cut -d" " -f2 | cut -d"=" -f2 | cut -d"," -f1 > user.txt

for i $(cat user.txt);do

echo "$userdn"
done
done

when I ran both ldapsearch commands invidually, they work fine. But when I ran script, I got first file correctly but not the second one. It looks like its not reading the first file correctly and not setting the variable ($userdn) value correctly in the second ldapseach command. I want read first file first line and run the second ldapsearch and continues, then read the second line..and so on.

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Programming :: Compare Two Files Line By Line And Print The Line Which Is Same?

May 30, 2011

I am trying to write a program in C which compares two files and prints the line that is equal.

Here file1.txt has

and file2.txt has

Note: file2.txt consist of only a single string where as file2.txt has multiple lines. Actually im comparing two files with md5sum values.

Here is the code but it compares only first line of files..but it should compare the whole file1..and sorry iam a beginner in C can any1 sujest some modification to this code so that..it can compare file2 with entire file1

Quote:

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Programming :: Insert Line Using Sed Or Awk At Line Using Line Number As Variable

Jul 25, 2011

I want to insert a line at a particular line number using sed or awk. where line number is not fixed and is in form of variable.

I want to use variable in sed or awk command.I tried something like below, but no luck.

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General :: Create Cron Tab When DSL Line Down Set Automatically Restart The Network Service While DSL Line Up?

Oct 7, 2010

How to create cron tab when DSL line down set automatically restart the network service while DSL line up?

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General :: Getting The Line Of String From Previous Pipe Output By Line Number?

Feb 8, 2010

After running the following command, I get:

[root@yukiko /]# find / -iname .bashrc
/home/clamav/.bashrc
/home/vpopmail/.bashrc
/etc/skel/.bashrc
/root/.bashrc

But I would like to have a command that prints a specific line by supplying the command with the line number, for example:

[root@yukiko /]# find / -iname .bashrc | getline(2)
/home/vpopmail/.bashrc

Is there such a command on CentOS?

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General :: Script To Count # Of Chars Per Line - If Line Meets Certain Criteria - And Get Avg #?

Sep 11, 2009

I have several files with many lines something like this:

I'm trying to write a script that will count the number of characters per line that doesn't contain a ">" symbol and give me an average of those values. I have most of the script together but I can't figure out how to connect some of the steps.

Code:

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Programming :: Add Line To A File ( 3rd Line)?

Apr 6, 2011

going back to my earlier post "Last digit minus ONE", when i get a Ip addresse with minus 1 ($ip), i need to add the new Ip address ($ip) to resolv.conf of that system. so from resolve.conf:

Code:

# /etc/resolv.conf .......
domain mydomain.ca
nameserver 11.21.36.98
nameserver 11.21.37.98

[code]...

tried with sed

Code:

sed 'nameserver $ip/domain/G' -f /etc/resolv.conf

but not able to get it.

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